表面等离子体谐振金光栅基底的光学放大:具有170倍二次谐波产生和3倍(非共振)拉曼散射的单层MoS2

IF 3.3 3区 物理与天体物理 Q2 PHYSICS, CONDENSED MATTER
Joonas T. Holmi , Ramesh Raju , Jonas Ylönen , Nagarajan Subramaniyam , Harri Lipsanen
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引用次数: 2

摘要

纳米等离子体是下一代片上光子器件和计算机发展的潜在改变者,由于其几何控制和放大的线性和非线性光学过程。例如,它解决了独特的二维(2D)晶体材料(如半导体单层二硫化钼(1L-MoS2))的有限光物质相互作用。金属光栅(MG)衬底在这方面表现优异,因为它们的表面等离子体(SPs)可以导致表面附近的stark场约束。本文研究了1L-MoS2在金(Au) MG衬底上的光学放大,该衬底设计为在850 nm激发波长下在甘油环境下以SP共振(SPR)工作。通过模拟反射率和实验反射率验证了其设计,并通过原子力显微镜(AFM)进行了形貌检测。两种先进的成像方式,二次谐波产生(SHG)和共聚焦拉曼显微镜(CRM)分别用于评估其170倍的SHG和3倍的CRM非共振光学放大。由于被困液体导致的mos2与光栅的粘附问题表现为图像不均匀。还讨论了对表面粗糙度等限制的可能改进。这些金镁基板可以增强传统的线性和非线性后向散射显微镜,因为它们可以通过选择几何形状、金属和环境在可见光和近红外范围内进行调谐。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Optical amplification by surface-plasmon-resonant Au grating substrates: Monolayer MoS2 with 170-fold second harmonic generation and 3-fold (off-resonance) Raman scattering

Optical amplification by surface-plasmon-resonant Au grating substrates: Monolayer MoS2 with 170-fold second harmonic generation and 3-fold (off-resonance) Raman scattering

Nanoplasmonics is a potential game-changer in the development of next-generation on-chip photonic devices and computers, owing to the geometrically controlled and amplified linear and nonlinear optical processes. For instance, it resolves the limited light-matter interaction of the unique two-dimensional (2D) crystalline materials like semiconducting monolayer molybdenum disulfide (1L-MoS2). Metal grating (MG) substrates excel at this because their surface plasmons (SPs) can lead to stark field confinement near the surface. This work studies optical amplification of 1L-MoS2 on the gold (Au) MG substrate, which was designed to operate in a glycerol environment with SP resonance (SPR) at 850 nm excitation wavelength. Its design was verified by simulated and experimental reflectances, and topographically inspected by atomic force microscopy (AFM). Two advanced imaging modalities, second harmonic generation (SHG) and confocal Raman microscopy (CRM) were used to evaluate its 170-fold SHG on- and 3-fold CRM off-resonance optical amplifications, respectively. Some MoS2-to-grating adhesion issues due to trapped liquid showed as image nonuniformities. Possible improvements to limitations like surface roughness were also discussed. These Au MG substrates can boost conventional linear and nonlinear backscattering microscopies because they are tunable in the visible and near-infrared range by selecting geometry, metal, and environment.

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来源期刊
Superlattices and Microstructures
Superlattices and Microstructures 物理-物理:凝聚态物理
CiteScore
6.10
自引率
3.20%
发文量
35
审稿时长
2.8 months
期刊介绍: Micro and Nanostructures is a journal disseminating the science and technology of micro-structures and nano-structures in materials and their devices, including individual and collective use of semiconductors, metals and insulators for the exploitation of their unique properties. The journal hosts papers dealing with fundamental and applied experimental research as well as theoretical studies. Fields of interest, including emerging ones, cover: • Novel micro and nanostructures • Nanomaterials (nanowires, nanodots, 2D materials ) and devices • Synthetic heterostructures • Plasmonics • Micro and nano-defects in materials (semiconductor, metal and insulators) • Surfaces and interfaces of thin films In addition to Research Papers, the journal aims at publishing Topical Reviews providing insights into rapidly evolving or more mature fields. Written by leading researchers in their respective fields, those articles are commissioned by the Editorial Board. Formerly known as Superlattices and Microstructures, with a 2021 IF of 3.22 and 2021 CiteScore of 5.4
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